2×[(3/8-3/4×1/3)÷1/4]=2×[(3/8-1/4)÷1/4]=2×[1/8÷1/4]=2×1/2=1
2×[(3/8-3/4×1/3)÷1/4]=2×[(3/8-1/4)x4]=2×[1/8x4]=2×1/2=1谢谢,请采纳
请采纳
=2*(3/8-1/4)*4=2*1/8*4=1